oventrop OVSOL System 5 Manual page 7

The following chart will help you determine the tilt angle of roof pitches. For space heating systems, always
have collectors sloped at optimal tilt for winter performance.
Install a collector rack whenever necessary.
Integrating with Building Architecture
Maintaining a pleasing appearance to the buildings architecture is important for adding solar collectors to a
roof or on the ground. Most homes are not oriented well for solar gain, so getting the collectors at just the
right orientation and tilt may not integrate well with the roof lines.
With domestic hot water systems, there are greater variations to tilt and orientation without large annual
losses, and in some cases may justify flush-mounting collectors. Space heating systems must have a
steep slope and be oriented within 30° of true south. For these larger space heating systems, the layout
should integrate into the roofline. For new construction, integrating OVSOL collectors into the building's
roof system should be addressed by the solar designer to the architect.
Shedding Snow
A tilt angle of 50° or more is necessary in regions of heavy snowfall and accumulation. Tilt angles of 50°
and above will shed snow from OVSOL- 5 collectors even after severe storms. It is critical in heavy snow
areas that the collectors be sloped to at least a 50° tilt angle. If collectors are installed on a flat roof in an
area which receives heavy snowfalls, the lower end of the units should be at least 18" above the roof level
to minimize chances of snow build-up on the bottom end of the evacuated tubes.
Shading
To avoid shading by collectors on each other, the front to front dimension must be 2.5 times the highest
point of the front collector.
Roof Pitch Tilt Angle
4/12 18°
6/12 26°
10/12 39°
Roof Pitch Tilt Angle
12/12 45°
14/12 49°
22/12 61°
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